Horse rears when being led?

I have a 14 year old mare that rears *only* when being led. When she is being rode she is a perfect little angel. Most of the time when I walk her she is good, but it is when I go to bring her in from the paddock that she becomes a horror. She will bolt forward, spin, and then rear at me. But she does not strike out (luckily) but it is a high rear (all the way up). Yesterday she did this and I had to let go of her lead and back up a couple steps to avoid getting hit by her hooves. When she came down she started nibbling on the grass! So I grabbed the lead and gave her a small whack, and then walked her to the barn without another problem. I have dealt with another horse that used to rear, but he only reared when you went to turn him into the paddock, at the gate since he had learned bad manners from his old owner. I broke him of that by join up (since he reared out of fear due to the sound of the lead chain being taken off frightened him and he did not like his face being touched), but my mare is another issue. She is not scared but defiant. I talked to a girl (after I got her) that used to work on the farm where I got her from and she said that she used to rear all the time when taken from the paddock (even though she comes to the gate right away to come in!). She is leaving no buddies behind in the paddock so it is not that. I have joined up with her and she loves me, will chase after me and play tag and I have also tried making her work on a lunge for a while after she rears so she will associate rearing with work but it is not working! Help!!!

Ps. I can not crack an egg over her head when she rears up because she is 15.1hh tall and she rears at her full height!